#7 New forms

* introduces bootstrap class form-control for proper html form input rendering
* fixes bug where missing shared users for an entry resulted in a None exception
* adds GenerateInput with template in generate-content-input.html, which provides a generate button for fetching server-side content
* adds/updates translations

intervention/views.py

@@ -1,6 +1,6 @@
 from django.contrib.auth.decorators import login_required
 from django.utils.translation import gettext_lazy as _
-from django.http import HttpRequest
+from django.http import HttpRequest, JsonResponse
 from django.shortcuts import render, get_object_or_404
 
 from intervention.forms.forms import NewInterventionForm, EditInterventionForm
@@ -83,11 +83,30 @@ def new_view(request: HttpRequest):
     context = {
         "data_form": data_form,
         "geom_form": geom_form,
+        "url": reverse("intervention:new-id")
     }
     context = BaseContext(request, context).context
     return render(request, template, context)
 
 
+@login_required
+def new_id_view(request: HttpRequest):
+    """ JSON endpoint
+
+    Provides fetching of free identifiers for e.g. AJAX calls
+
+    """
+    tmp_intervention = Intervention()
+    identifier = tmp_intervention._generate_new_identifier()
+    while Intervention.objects.filter(identifier=identifier).exists():
+        identifier = tmp_intervention._generate_new_identifier()
+    return JsonResponse(
+        data={
+            "identifier": identifier
+        }
+    )
+
+
 @login_required
 def new_document_view(request: HttpRequest, id: str):
     """ Renders a form for uploading new documents